These Ryman Envelopes are C6 sized, 90gsm and come in a pack of 50.These envelopes feature a peel and seal closure making them easy to use and more hygienic than standard gummed envelopes and are ideal for sending folded A5 documents, vouchers, invitations or letters. They have a blue obscuring pattern inside so that the contents does not appear visible from the outside and would be classed as a small letter when it comes to postal charges.These C6 Ryman Envelopes are a must have for any office, school or home as they make correspondence appear professional and attractive.